This scanning/inspection message warns you that there are some objects that are completely off any of the pages of the GridTemplate that you are trying to scan.

Note that this message is not due to an object being placed slightly off the page to ensure proper bleed at cutting time. The present message is due to an object being totally off as in the example below:

You should immediately take care of this message and then rescan your grid. Otherwise, if ignored, this scanning message could lead to the run-time messages 108532 or 176450, both of which will cause QuarkXPress to miss boxes during token replacement, at best, or eventually crash, at worst.